Dividing a property into separate parcels can open new opportunities—but it also introduces unique challenges when it’s time to sell. With the property already in escrow, it’s crucial to address capital gains planning now to avoid costly surprises at tax time. If you’re selling the main house after a subdivision, proper allocation of your cost basis and qualifying for the primary residence exclusion are essential steps for financial clarity and compliance.

Primary Residence Exclusion: Are You Eligible?

The IRS allows you to exclude up to $250,000 ($500,000 for married couples filing jointly) in capital gains if you meet the ownership and use tests—specifically, having owned and lived in the home for at least two of the last five years. When a property is subdivided, this exclusion typically applies only to the parcel with the main house. If you’re selling land separately, it may qualify if sold within two years and used as part of your principal residence. Documentation matters—keep records like voter registration, driver’s license, and tax returns to support your case if audited.

Allocating Cost Basis: Two TMKs, One Tax Bill

Now that your property has two Tax Map Keys (TMKs), the original purchase price and improvements must be allocated between the parcels based on their fair market values at the time of subdivision. This allocation determines your cost basis for the parcel you’re selling, directly affecting your capital gains calculation. Don’t forget: selling expenses such as realtor fees and transfer taxes can be deducted to reduce your taxable gain. Accurate records of capital improvements are key for maximizing your cost basis.

Hawaii Escrow and Withholding Essentials

Hawaii’s HARPTA rules require withholding 7.25% of the gross sales price for non-residents, unless your escrow company is properly instructed. Make sure Form 1099-S is issued only for the TMK actually being sold. These details can make a big difference in your post-sale tax situation.

Act Now: Consult a Tax Professional

With the sale in escrow, immediate consultation with a CPA or tax attorney—especially one familiar with Hawaii real estate—is strongly recommended. They can guide you through the specifics of your subdivision, cost basis allocation, and ensure you qualify for any exclusions. Taking action now safeguards your financial clarity and supports a smooth closing.

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